Double-Pedal Double-Wheel Truckle with Independent Braking and Releasing Functions

ABSTRACT

A double-pedal double-wheel truckle with independent braking and releasing functions is a truckle for a precision instrument and comprises a body, a rotating &amp; locking device, a truckle body device, a braking device and a bottom cover body. The body is provided for disposing a rotating &amp; locking device, a truckle body device, a braking device and a bottom cover body. With the independent braking and releasing functions of the braking device of the body, the user can easily operate and stably block the rotating &amp; locking device and the truckle body device. The bottom cover body is provided for preventing foreign matters from entering the truckle body device, so that the truckle can be locked from rotation. By such arrangements, it can achieve the objectives, such as easy operation, easy to distinguish braking state, stable braking, reducing noises, strengthening structure and safe usage, etc.

This application is a continuation of part of U.S. patent applicationSer. No. 11/862,637, which claims the benefit of the earlier filing dateof Sep. 27, 2007. Claims 1-7 of this application correspond to theclaims 1-7 of the U.S. patent application Ser. No. 11/862,637, claims8-14 of this application correspond to claims 14-20 of the U.S. patentapplication Ser. No. 11/862,637, respectively.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a truckle with braking and releasingfunctions, and more particularly to a truckle with independent brakingand releasing functions suitable for a precision instrument, whichutilizes a braking device to provide the user the functions, such aseasy operation, easy to distinguish the braking state, stable braking,avoiding noises and safe usage, etc.

2. Description of the Prior Art

A conventional truckle structure disclosed in Taiwan Design Patent No.339,043 is an improvement of a truckle structure. On the top of thetruckle rack of this truckle structure is disposed a holding platform. Abraking device is suspended from the front end of the holding platform.The holding platform includes opposite through holes in both side boardsthereof, at least one pivot hole in the protruding ear at the front endof each side board, at least one fastening portion inside each sideboard adjacent to the protruding ear. The fastening portion includes alongitudinal end board forming on the inside surface of the side boardadjacent to the protruding ear. The tip end of the longitudinal endboard extends backward out of a side stopping board. A transverseengaging block is disposed in a region surrounded by the longitudinalend board and the side stopping board. In addition, a fastener isdisposed on the side board.

The above conventional truckle structure has the followingdisadvantages:

1. Difficult to operate: the braking structure of the braking device isintegrated with the releasing structure. By such a design, the brakingoperation and the releasing operation cannot be substantially achieved.Thereby, it cannot provide an easy operation and high safety;

2. Cost wasting: the braking device is suspended form the front end ofthe holding platform, and such a design is a two-segment design and isunlikely to be an integrated structure, so it is required toadditionally manufacture the braking component after the holdingplatform is completed, thus increasing a manufacturing process andcausing the material waste;

3. Difficult to manufacture: On the top of the truckle rack is disposeda holding platform. The holding platform includes opposite through holesin both side boards thereof, at least one pivot hole in the protrudingear at the front end of each side board, at least one fastening portioninside each side board adjacent to the protruding ear and a longitudinalend board forming on the inside surface of the side board adjacent tothe protruding ear. The tip end of the longitudinal end board extendsbackward out of a side stopping board. In a region surrounded by thelongitudinal end board and the side stopping board is disposed atransverse engaging block. The highly complicated side board isdifficult to manufacture.

4. Truckle deformation: since the braking device of the holding platformdirectly presses against the truckle body and a pivot rotating position,such a braking action is likely to cause the deformation of the trucklebody.

5. Easy damage: on the top of the truckle are disposed a holdingplatform and the side boards of the holding platform, etc, so theassembled truckle rack needs to support the structures of the holdingplatform, etc, thus improving the damage rate of the truckle rack.

6. Poor stability: the braking structure is integrated with thereleasing structure of the braking device, by such a design, when inuse, the user is likely to synchronously perform the braking action andthe releasing action, thus causing the poor operational stability.

The present invention has arisen to mitigate and/or obviate theafore-described disadvantages.

SUMMARY OF THE INVENTION

The present invention relates to a double-pedal double-wheel trucklewith independent braking and releasing functions. The truckle issuitable for a precision instrument and comprises a body. The body isprovided for disposing a rotating & locking device, a truckle bodydevice and a braking device. The braking device is disposed in themiddle of the rotating & locking device and the truckle body device.With the above integral structure, it can achieve the objectives of easyoperation, easy to distinguish the braking state, stable braking,reducing noises, strengthening structure and safe usage, etc.

The present invention further relates to a double-pedal double-wheeltruckle with independent braking and releasing functions. The truckle issuitable for a precision instrument and comprises a body. With thebraking and releasing functions of a braking device of the body, therotating & locking device and the truckle body device can be firmlypositioned, and the user can easily distinguish the braking state,operate and stably block the truckle through the braking device, so asto keep the truckle suitable for the precision instrument in a safelocked state, thus achieving the objectives of easy operation, easy todistinguish the braking state, stable braking and safe usage, etc.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of a double-pedal double-wheel truckle withindependent braking and releasing functions in accordance with thepresent invention;

FIG. 2 is an exploded view of the double-pedal double-wheel truckle withindependent braking and releasing functions in accordance with thepresent invention;

FIG. 3 is a cross sectional view of the double-pedal double-wheeltruckle with independent braking and releasing functions in accordancewith the present invention;

FIG. 4 is a perspective view showing that the double-pedal double-wheeltruckle with independent braking and releasing functions in accordancewith the present invention is operated; and

FIG. 5 is a cross sectional view showing the double-pedal double-wheeltruckle with independent braking and releasing functions in accordancewith the present invention is operated.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

The present invention will be clearer from the following descriptionwhen viewed together with the accompanying drawings, which show, forpurpose of illustrations only, the preferred embodiment in accordancewith the present invention.

Referring to FIGS. 1-5, a double-pedal double-wheel truckle A withindependent braking and releasing functions in accordance with thepresent invention, which is suitable for a precision instrument,comprises a slide-shaped body 10 formed with a plurality ofinserting-receiving configurations. The body 10 includes a rotating &locking device 20, a truckle body device 30, a braking device 40 and abottom cover body 50. The braking device 40 is disposed between therotating & locking device 20 and the truckle device 30 of the body 10.The bottom cover body 50 is disposed at one end of the rotating &locking device 20 and the truckle body device 30 for preventing foreignmatters from entering inside. With the braking and releasing functionsof the braking device 40 of the body 10, the user can easily operate andstably block the rotating & locking device 20 and the truckle bodydevice 30. Additionally, the bottom cover body 50 is used to preventforeign matters form entering inside, so that the truckle A can bestably actuated, safely moved or locked from rotation. By sucharrangements, the present invention can achieve the objectives, such aseasy operation, easy to distinguish braking state, stable braking,reducing noises, strengthening structure and safe usage, etc.

The body 10 is a slide-shaped body including a plurality ofinserting-receiving configurations. One end of the body 10 is formedwith a through round receiving portion 11 of a big diameter for holdingthe rotating & locking device 20. Adjacent to the receiving portion 11is disposed a matching body 12 with opposite arc-shaped members. Thematching body 12 includes a round receiving hole 120 and a plurality ofround through holes 121A, 121B of a small diameter and a plurality ofelongated fastening holes 122. The receiving hole 120 is provided forinsertion of the truckle body device 30, and the holes 121A, 121B areprovided for the insertion of the braking device 40. The fastening hole122 is provided for the insertion of the bottom cover body 50.

The rotating and locking device 20 includes a stepped column-shapedinserting member 21, a disc-shaped hollow matching member 22, a roundbearing member 23, at least more than one round hollow washer member 24,a disk-shaped multi-tooth fastening member 25 and a round hollow fixingmember 26. One end of the inserting member 21 is fixed to the precisioninstrument, and the other smaller end of the inserting member 21 isinserted into the matching member 22, the bearing member 23, and thewasher member 24. A free end of the inserting member 21 is disposed inthe fastening member 25. The matching member 22 is covered outside thereceiving portion 11 and includes an inserting portion 220. Theinserting portion 220 is inserted through the center of the bearingmember 23. The bearing member 23 is positioned in the receiving portion11 and a round stepped washer member 24, and the other end of the washermember 24 is formed with the fastening member 25. The fastening member25 includes a cross-shaped receiving hole 250 for receiving theinserting member 21, and a multi-tooth inside-concave fastening portion251 for fastening with the braking device 40. The fixing member 26 isfixed to one end of the inserting member 21.

The truckle body device 30 includes at least more than one pair of roundshield-shaped shell members 31, at least more than one pair of roundwheel-shaped wheels 32, at least more than one pair of disc-shapedmulti-level driven members 33, at least more than one pair of roundbearing members 34 and a solid column-shaped middle shaft 36. The shellmember 31 is vertically formed with at least more than one roundprotruding engaging portion 310 with a cross groove. The protrudingengaging portion 310 is disposed in the driven member 33. Additionally,the wheel 32 is mounted on a rounding outer end of the driven member 33for facilitating the wheel 32 freely rotating around the free end of thedriven member 33. The driven member 33 includes a plurality of engagingholes 330 engaged with the protruding engaging portions 310 of the shellmember 31, a plurality of tooth-shaped engaging portions 331 formed onan inner surface of the driven member 33, and a plurality of lockingportions 332 formed around an outer periphery of a protruding flangearound a central hole of the driven member 33. The engaging portions 331and the locking portion 332 are provided for engaging with the bakingdevice 40. In addition, the bearing member 34 is positioned outside thematching body 12 and in the hollow position of the driven member 33. Themiddle shaft 36 is inserted through the matching body 12 and the bearingmember 34 for restricting the deviation of the bearing member 34.

The braking device 40 includes a mushroom-shaped releasing member 41, aL-shaped actuating member 42 and a flexuous chip-shaped releasing &stopping member 43. One end of the releasing member 41 is formed with areleasing portion 410 including a plurality of symmetrical parallelantiskid ribs for the user to step on without slippage, and the otherend of the releasing member 41 is folded 90 degrees and formed with athrough connecting hole 411 at the folded portion thereof for pivotallycoupling the pivot shaft to the holes 121A of the matching body 12.Furthermore, the folded end of the releasing member 41 is pivotallylinked to the actuating member 42 by a pivot shaft 412, and on thesurface of the folded end of the releasing member 41 is formed aprotruding stop portion 413. One end of the actuating member 42 includesa plurality of through coupling holes 420A, 420B, and the other end ofthe actuating member 42 includes an actuating portion 421 with aplurality of antiskid parallel ribs for the user to step on withoutslippage. The through coupling holes 420A and the through connectinghole 411 of the releasing member 41 are provided for the insertion ofthe pivot shaft 412. The through coupling hole 420B is pivotally fixedat one end of the releasing &stopping member 43 by a pivot shaft. Avertical stop portion 422 is formed between two coupling holes 420A.

The releasing & stopping member 43 is formed with two oppositeear-shaped matching portions 430 with a round hole. An arc-shapedelastic return member 431 is formed on an elastic sheet portion betweenthe two opposite matching portions 430 and protrudes in an oppositedirection to the matching portions 430. Two fastening portions 432 eachof which being in the form of through hole formed by two oppositesemi-circled portions are formed at both sides of the elastic sheetportion. Both sides of the elastic sheet portion extend in an oppositedirection to the matching portions 430 to form two hook-shaped abuttingengaging portions 433. The middle portion of the elastic sheet portionextends in an opposite direction to the matching portions 430 to form anabutting fastening portion 434. At the end of each of two sides of theelastic sheet portion is formed an abutting locking portion 435 whichextends in an opposite direction to the matching portions 430.

A pivot shaft is inserted through matching portion 430 and the throughcoupling hole 420B of the actuating member 42, and the elastic returnmember 431 is disposed in the middle of the fastening portion 432 andsupports against the internal end surface of the matching body 12. Thefastening portion 432 is formed with the round through holes 121A, 121Bof the matching body 12 for inserting a pivot rod. The abutting engagingportions 433, the abutting fastening portion 434 and the abuttinglocking portions 435 can be positioned against the fastening portion 251of the fastening member 25 of the rotating & locking device 20 and theengaging portion 331 and the locking portion 332 of the driven member 33of the truckle body device 30 by cooperating with the braking orreleasing action of the releasing member 41 and the driven member 42.

The bottom cover body 50 is an integrated chip body with a fasteningportion 51, which extends adjacent to the body 10. The fastening portion51 is fastened to the fastening hole 122 of the body 10. By firmlyfastening the fastening portion 51 of the bottom cover body 50 with thefastening hole 122 of the body 10, it can prevent the foreign mattersfrom blocking the actuation of the truckle body device 30.

When the releasing member 41 is stepped downward, as shown in FIGS. 1-3,the releasing portion 410 of the releasing member 41 will be pressedagainst the matching body 12, and the actuating member 42 will rotatearound the coupling holes 420B, making the actuating portion 421 tiltupward. At this moment, the abutting engaging portions 433, the abuttingfastening portion 434 and the abutting locking portions 435 aredisengaged from the engaging portions 331, the locking portion 332 andthe fastening portion 251, so that the truckle body device 30 is in abrake-release state and free to rotate.

Further referring to FIGS. 4-5, when the user steps on the actuatingmember 42 of the braking device 40, and the actuating member 42 willrotate around the coupling holes 420B and will drive the releasingmember 41 by the releasing &stopping member 43 to make the abuttingengaging portion 433 of the releasing &stopping member 43 engage withthe engaging portion 331 of the driven member 33 of the truckle bodydevice 30, and make the abutting fastening portion 434 engage with thefastening portion 251 of the fastening member 25 of the rotating &locking device 20. Meanwhile, the abutting locking portion 435 will alsobe caused to engage with the locking portions 332. By such arrangements,the rotating & locking device 20 and the truckle body device 30 aremaintained in a brake state in which the truckle body device 30 islocked from rotation. The releasing member 41 and the actuating member42 of the braking device 40 are separated when in use, meanwhile, thestop portion 413 of the releasing member 41 and the stop portion 422 ofthe actuating member 42 are engaged with each other, thus facilitatingthe user distinguishing the braking state, safely operating and brakingthe braking device 40. Thereby, the truckle A can provide the functionssuch as an easy operation, easy to distinguish the braking state, astable braking and a safe usage, etc, thus achieving the objectives ofsaving the material cost and shortening the manufacturing time.

With the above structures, the present invention can provide thefollowing functions, such as:

1. Easy operation: when the user steps on the actuating member 42 of thebraking device 40, the actuating member 42 linked with the releasing&stopping member 43 will drive the releasing member 41 to make theabutting engaging portion 433 of the releasing &stopping member 43substantially engage with the engaging portion 331 of the driven member33 of the truckle body device 30, and make the abutting fasteningportion 434 be substantially fastened to the fastening portion 251 ofthe fastening member 25 of the rotating & locking device 20, meanwhile,the abutting locking portion 435 are caused to engage with the lockingportions 332, so that the rotating & locking device 20 and the trucklebody device 30 are maintained in a brake state in which the truckle bodydevice 30 is locked from rotation. By such a design, the user candefinitely operate the braking and releasing actions. Thereby, thepresent invention can really offer the functions of easy operation andsafety;

2. Cost saving: the releasing member 41 and the actuating member 42 ofthe braking device 40 provided for the user to step on are pivotallycoupled to the releasing & stopping member 43 and the matching body 12of the body 10, respectively. By such a pivot design of a simplifiedlinkage structure, it is not required to additionally add amanufacturing process, thus saving the cost;

3. Components are difficult to damage: the releasing member 41, theactuating member 42 and the releasing & stopping member 43 of thebraking device 40 provided for the user to step on are pivotally coupledto the through holes 121 A, 121 B and the receiving hole 120 of thematching body 12, and the releasing member 41 and the actuating member42 are pivotally coupled to the releasing & stopping member 43 to linkeach other. By such a design, the applied force is dispersed, and thusit is unlikely to increase the damage rate of the body structure of thetruckle;

4. Fine stability and easy to distinguish: when the user step on theactuating member 42 of the braking device 40, the actuating member 42linked with the releasing & stopping member 43 will drive the releasingmember 41, and the actuating member 42 and the releasing member 41 arevertically separated. By such a design, it can provide the user theadvantages, easy to distinguish the braking and releasing states, stablebraking, thus offering the functions, easy to distinguish and finestability;

5. Easy to manufacture: the releasing member 41, the actuating member 42and the releasing & stopping member 43 of the braking device 40 providedfor the user to step on, are made by injection molding or extrusion. Bysuch a design, it is easy to manufacture the braking device 40;

6. Stable actuation: the bottom cover body 50 is an integrated chipbody, and the bottom cover body 50 is formed with a plurality offastening portions 51 to fasten with the fastening holes 122 of the body10. By such a design, the bottom cover body 50 can be firmly fastened tothe body 10 to prevent the foreign matters from blocking the actuationof the truckle body device 30.

While we have shown and described various embodiments in accordance withthe present invention, it is clear to those skilled in the art thatfurther embodiments may be made without departing from the scope of thepresent invention.

1. A double-pedal double-wheel truckle with independent braking andreleasing functions suitable for a precision instrument, comprising: abody, a rotating & locking device, a truckle body device, and a brakingdevice; wherein: the body is provided for disposing the rotating &locking device, the truckle body device and the braking device; therotating & locking device includes a fastening member which is disposedat one end of the body and provided for fastening with the brakingdevice; the truckle body device is disposed at both sides of the bodyfor engaging with the braking device; the braking device includes areleasing member, an actuating member, and a releasing & stoppingmember, the releasing member is pivotally coupled in the body, and oneend of the releasing member extends out of the body and is formed with areleasing portion, the actuating member has one end pivoted to thereleasing member, another end of the actuating member extends out of thebody and is formed with an actuating portion, the one end of actuatingmember pivoted to the releasing member is coupled to the releasing &stopping member in the body, the releasing & stopping member ispivotally coupled in the body and extends toward the fastening member ofthe rotating & locking device and one end of the truckle body device toform an abutting engaging portion, an abutting fastening portion and anabutting locking portion, when the releasing portion of the releasingmember and the actuating portion of the actuating member are separated,the abutting engaging portion, the abutting fastening portion and theabutting locking portion of the releasing member are disengaged from thefastening member and the truckle body device, and when the releasing &stopping member and the releasing portion of the releasing member arepressed toward the body, the abutting engaging portion, the abuttingfastening portion and the abutting locking portion of the releasingmember are engaged with the fastening member and the truckle bodydevice, so that the truckle body device is locked from rotation.
 2. Thedouble-pedal double-wheel truckle with independent braking and releasingfunctions as claimed in claim 1, wherein the body includes a receivingportion, and a plurality of matching bodies, the receiving portion isprovided for disposing the rotating & locking device, each of thematching bodies is disposed adjacent to the receiving portion of thebody and includes a receiving hole, a plurality of through holes and aplurality of fastening holes, the receiving hole of each of the matchingbodies is provided for disposing the truckle body device, the throughholes of each of the matching bodies are provided for disposing thebraking device, and the fastening holes are provided for fastening witha bottom cover body.
 3. The double-pedal double-wheel truckle withindependent braking and releasing functions as claimed in claim 1,wherein the rotating & locking device includes an inserting member, amatching member, a bearing member, at least one washer member, and thefastening member, one end of the inserting member of the rotating &locking device is disposed in the precision instrument, and another endof the inserting member of the rotating & locking device is insertedthrough the matching member, the bearing member, the washer member andthe fastening member, the matching member is mounted outside thereceiving portion and formed with an inserting portion, the insertingportion of the matching member is inserted through the bearing member,and the bearing member is disposed on one end of the washer member, andanother end of the washer member is formed with the fastening member,and the fastening member is formed with a receiving hole for aninsertion of the inserting member, and a fastening portion for fasteningwith the braking device.
 4. The double-pedal double-wheel truckle withindependent braking and releasing functions as claimed in claim 1,wherein the truckle body device includes at least one pair of roundshield-shaped shell members, at least one pair of round wheel-shapedwheels, at least one pair of disc-shaped multi-level driven members, atleast one pair of round bearing members and a solid column-shaped middleshaft, the shell member is vertically formed with at least one roundprotruding engaging portion with a cross groove, the protruding engagingportion is disposed in the driven member, the wheel is mounted on arounding outer end of the driven member for facilitating the wheelfreely rotating around a free end of the driven member, the drivenmember includes a plurality of engaging holes engaged with theprotruding engaging portions of the shell member, a plurality oftooth-shaped engaging portions formed on an inner surface of the drivenmember, and a plurality of locking portions formed around an outerperiphery of a protruding flange around a central hole of the drivenmember, the engaging portions and the locking portion are provided forengaging with the baking device, the bearing member is positionedoutside the matching body and in a hollow position of the driven member,the middle shaft is inserted through the matching body and the bearingmember for restricting deviation of the bearing member.
 5. Thedouble-pedal double-wheel truckle with independent braking and releasingfunctions as claimed in claim 1, wherein the releasing member ismushroom-shaped, the actuating member is L-shaped and the releasing &stopping member is flexuous chip-shaped, the releasing portion consistsof a plurality of symmetrical parallel antiskid ribs for a user to stepon without slippage, and another end of the releasing member is folded90 degrees and formed with a through connecting hole at the foldedportion thereof for pivotally coupling a pivot shaft to holes of thematching body, the folded end of the releasing member is pivotallylinked to the actuating member by a pivot shaft, and on a surface of thefolded end of the releasing member is formed a protruding stop portion,one end of the actuating member includes a plurality of through couplingholes, and another end of the actuating member includes an actuatingportion with a plurality of antiskid parallel ribs for the user to stepon without slippage, the through coupling holes and the throughconnecting hole of the releasing member are provided for the insertionof the pivot shaft, the through coupling hole is pivotally fixed at oneend of the releasing &stopping member by a pivot shaft, and a verticalstop portion is formed between two coupling holes.
 6. The double-pedaldouble-wheel truckle with independent braking and releasing functions asclaimed in claim 5, wherein the releasing & stopping member includes twoopposite ear-shaped matching portions with a round hole, an arc-shapedelastic return member is formed on an elastic sheet portion between thetwo opposite matching portions and protrudes in an opposite direction tothe matching portions, two fastening portions each of which being in theform of through hole formed by two opposite semi-circled portions areformed at both sides of the elastic sheet portion, both sides of theelastic sheet portion extend in an opposite direction to the matchingportions to form two hook-shaped abutting engaging portions, a middleportion of the elastic sheet portion extends in an opposite direction tothe matching portions to form an abutting fastening portion, at one endof each of two sides of the elastic sheet portion is formed an abuttinglocking portion which extends in an opposite direction to the matchingportions, a pivot shaft is inserted through matching portion and thethrough coupling hole of the actuating member, and the elastic returnmember is disposed in the middle of the fastening portion and supportsagainst the internal end surface of the matching body, the fasteningportion is formed with the round through holes of the matching body forfastening with the braking device, the abutting engaging portions, theabutting fastening portion and the abutting locking portions arepositioned against the fastening portion of the fastening member of therotating & locking device and the engaging portion and the lockingportion of the driven member of the truckle body device through brakingor releasing action of the releasing member and the driven member.
 7. Adouble-pedal double-wheel truckle with independent braking and releasingfunctions as claimed in claim 1, wherein the body is formed with aplurality of fastening holes for fastening with a bottom cover body, andthe bottom cover body includes a plurality of fastening portions forfastening with the fastening holes of the body.
 8. A double-pedaldouble-wheel truckle with independent braking and releasing functionssuitable for a precision instrument, comprising: a body, a rotating &locking device, a truckle body device, and a braking device; wherein:the body includes a receiving portion, a plurality of matching bodies,the receiving portion is provided for disposing the rotating & lockingdevice, each of the matching bodies is disposed adjacent to thereceiving portion of the body and includes a receiving hole, and aplurality of through holes, the receiving hole of each of the matchingbodies is provided for disposing the truckle body device, the throughholes of each of the matching bodies are provided for disposing thebraking device; the rotating & locking device includes an insertingmember, a matching member, a round bearing member, at least one washermember, and a fastening member, one end of the inserting member of therotating & locking device is disposed in the precision instrument, andanother end of the inserting member of the rotating & locking device isinserted through the matching member, the bearing member, the washermember and the fastening member, the matching member is mounted outsidethe receiving portion and formed with an inserting portion, theinserting portion of the matching member is inserted through a center ofthe bearing member, and the bearing member is disposed in the receivingportion and formed with more than one washer member, another end of thewasher member is formed with the fastening member, and the fasteningmember is formed with a receiving hole for an insertion of the insertingmember, and a fastening portion for fastening with the braking device;the truckle body device includes at least one pair of shell members, atleast one pair of wheels, at least one pair of driven members, at leastone pair of bearing members and a middle shaft, the shell members, thewheels and the bearing members are disposed at the driven member, andthe middle shaft is inserted through the matching bodies of the body andthe bearing members of the truckle body device for restricting adeviation of the bearing members of the truckle body device; and thebraking device includes a releasing member, an actuating member, and areleasing & stopping member, the releasing member is pivotally coupledin the body, and one end of the releasing member is formed with areleasing portion, the actuating member is pivotally coupled in thebody, and one end of the actuating member is formed with an actuatingportion, both the releasing portion of the releasing member and theactuating portion of the actuating member extend outside the body for auser to actuate, another end of the releasing member is pivotallycoupled in the body and extends toward the fastening member of therotating & locking device and one end of the truckle body device to forman abutting engaging portion, an abutting fastening portion and anabutting locking portion, when the releasing portion of the releasingmember and the actuating portion of the actuating member are separated,the abutting engaging portion, the abutting fastening portion and theabutting locking portion of the releasing member are disengaged from thefastening member and the truckle body device, and when the releasing &stopping member and the releasing portion of the releasing member arepressed toward the body, the abutting engaging portion, the abuttingfastening portion and the abutting locking portion of the releasingmember are engaged with the fastening member and the truckle bodydevice, so that the truckle body device is locked from rotation.
 9. Thedouble-pedal double-wheel truckle with independent braking and releasingfunctions as claimed in claim 8, wherein each shell member includes atleast one protruding engaging portion which is disposed in the drivenmember, and each wheel is mounted on a rounding free end of each drivenmember, each driven member includes a plurality of engaging holes usedto engage with the protruding engaging portions of each shell member anda plurality of tooth-shaped engaging portions used to engage with thebraking device, each bearing member of the truckle body device isdisposed outside each of the matching bodies and in a hollow position ofeach driven member, and the middle shaft is inserted through thematching bodies and the bearing members for restricting deviation of thebearing members.
 10. The double-pedal double-wheel truckle withindependent braking and releasing functions as claimed in claim 8,wherein the releasing member is mushroom-shaped, the actuating member isL-shaped and the releasing & stopping member is flexuous chip-shaped,the releasing portion consists of a plurality of symmetrical parallelantiskid ribs for the user to step on without slippage, and another endof the releasing member is folded 90 degrees and formed with a throughconnecting hole at the folded portion thereof for pivotally coupling apivot shaft to holes of the matching body, the folded end of thereleasing member is pivotally linked to the actuating member by a pivotshaft, and on a surface of the folded end of the releasing member isformed a protruding stop portion, one end of the actuating memberincludes a plurality of through coupling holes, and another end of theactuating member includes an actuating portion with a plurality ofantiskid parallel ribs for the user to step on without slippage, thethrough coupling holes and the through connecting hole of the releasingmember are provided for the insertion of the pivot shaft, the throughcoupling hole is pivotally fixed at one end of the releasing &stoppingmember by a pivot shaft, and a vertical stop portion is formed betweentwo coupling holes; the releasing & stopping member includes twoopposite ear-shaped matching portions with a round hole, an arc-shapedelastic return member is formed on an elastic sheet portion between thetwo opposite matching portions and protrudes in an opposite direction tothe matching portions, two fastening portions each of which being in theform of through hole formed by two opposite semi-circled portions areformed at both sides of the elastic sheet portion, both sides of theelastic sheet portion extend in an opposite direction to the matchingportions to form two hook-shaped abutting engaging portions, a middleportion of the elastic sheet portion extends in an opposite direction tothe matching portions to form an abutting fastening portion, at one endof each of two sides of the elastic sheet portion is formed an abuttinglocking portion which extends in an opposite direction to the matchingportions, a pivot shaft is inserted through matching portion and thethrough coupling hole of the actuating member, and the elastic returnmember is disposed in the middle of the fastening portion and supportsagainst the internal end surface of the matching body, the fasteningportion is formed with the round through holes of the matching body forfastening with the braking device, the abutting engaging portions, theabutting fastening portion and the abutting locking portions arepositioned against the fastening portion of the fastening member of therotating & locking device and the engaging portion and the lockingportion of the driven member of the truckle body device through brakingor releasing action of the releasing member and the driven member. 11.The double-pedal double-wheel truckle with independent braking andreleasing functions as claimed in claim 8, wherein the releasing &stopping member includes a matching portion, an elastic return member, afastening portion, an abutting engaging portion and an abuttingfastening portion, a pivot shaft is inserted through the matchingportion of the releasing & stopping member and the through coupling holeof the actuating member, and the elastic return member is disposed inthe middle of the fastening portion of the releasing & stopping memberand supports against an inner end surface of the matching body of thebody, the fastening portion of the rotating & locking member is disposedin the through holes of the matching body for an insertion of a pivotrod, the abutting engaging portion and the abutting fastening portionare positioned against the fastening portion of the fastening member ofthe rotating & locking device and the engaging portion of the drivenmember of the truckle body device by cooperating with a braking orreleasing action of the releasing member and the actuating member. 12.The double-pedal double-wheel truckle with independent braking andreleasing functions as claimed in claim 8, wherein a bottom cover bodyis disposed between the rotating & locking device and the truckle bodydevice of the body for prevent foreign matters from entering inside. 13.The double-pedal double-wheel truckle with independent braking andreleasing functions as claimed in claim 8, wherein the body is providedwith a plurality of fastening holes, and a bottom cover body includes aplurality of fastening portions.
 14. The double-pedal double-wheeltruckle with independent braking and releasing functions as claimed inclaim 13, wherein the fastening holes of the body are provided forfastening with the fastening portions of the bottom cover body.